[GHC] #15064: T8089 mysteriously fails when GHC is built with LLVM

[GHC]

#15064: T8089 mysteriously fails when GHC is built with LLVM
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        Reporter:  bgamari           |                Owner:  osa1
            Type:  bug               |               Status:  new
        Priority:  highest           |            Milestone:  8.6.1
       Component:  Compiler (LLVM)   |              Version:  8.2.2
      Resolution:                    |             Keywords:  ci-breakage
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by osa1):

 Can't reproduce locally. Can you share the circleci link that shows the
 failure? What version of llvm does circleci use?

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15064#comment:5>
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